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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '34c1f1fb9452850a04748798269a8edf9ed17816f3184f754f3719d2337b92cb' 
  AND token = 'YYrmDAAnHhc/xxz2hJsdVyOiW22Q6bivkI2EUAnh37A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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