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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '55d9d753cd65351eeda58ddfd594bff7a7880424ac5b2e7259e70bf1cf2eba02' 
  AND token = 'nVRDSLiD0kRxDCkfK8X9zvrHIVZZeixhroRR+Wk3c0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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