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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c5cbc92644a6c722f01dfc540bba11b84dd8c128b5fc68ff8834a657990b9701' 
  AND token = 'kj5nWW4wfOOQ96/Qy0WL0w52danotJ/LWETfy2kJ0+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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