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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76655cfc7a2b438b2fa80e575e7cbbae45035e45aff036a5efd97b4d44a4a110' 
  AND token = 'x65iqsKmSjy1ZZgV+3x3riyFjsh4kV767xCHqMKn0pQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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