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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b73b06b6040d5de91c9cbbec9b4768dfbe03fb19b5b4395f575c8fcdf792b5d8' 
  AND token = 'CgaQdlEV00ila1bI2izECNmC1UKwYzSj5pXTTy10FZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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