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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2b3192beaafc9dc59a98675d0af502b7f7759ac043a24ab426a93d5966cf583c' 
  AND token = 'pyrPWcOA05sYVZ3vbtmSOmmHBt0VfJr1kdfwIOxpb1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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