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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'abcd7ef425ccd60f5d1f4cbb83d4886f6d32e60c8e71a581112a624d197e346e' 
  AND token = 'b5Y5YpmpuyvxZG2/wcN9G4lFrJF8BMT65AL4Cp6lF8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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