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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '16a20591b4a661b1c6d9bf9eca15b3a1b262af3a0a1ce0bb0edbbb3d106c8b2b' 
  AND token = 'YuiOeKXqFQ/Cm0fSNSZ6yEJCjf3cg+L84FIf5EAQdiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}