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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f45200e291b2f15ba59abeba1d28fdfccec155935d30ebcc98d231555a0d7c0' 
  AND token = 'yKLEKZ5IVTsuD2+SqFfZSqEOMFmuH893uLfMTnER7q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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