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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d50302414b0effa093fd9d2a9578d9e10d59509c4d595b299b3466e478e273c' 
  AND token = 'hW/r3HWdt+8nivc6fXZO2X7uLb1fRP8TJwEiNHQ/fDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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