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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af1c9814ebc12e17f2717270b38fdc51cc6b13712f4705a557ee1f8ddc3fd490' 
  AND token = 'w2xD9SS2PU5+5FZvy+zbbmAbQwreL4ADV9ls4o39pK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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