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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '55cf0a6ec4a40e2a0ecb9114b34a089abef395416f52baad7be38e2575543f81' 
  AND token = 'rFKlEP2R4SDw80oHFNXFvTs6rhExyA16vaWSALUJx4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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