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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd15b164a1fe3c093c4bf8c2e22f51ab226ddb3076a0c503f9d0ee3be43fc8c44' 
  AND token = 'CHTQYdc3H30JAiRYcspjJGMH6OC+tBy8NnlV70nXAsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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