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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c146d48c965304a05275cdda4a0e02dff081b464e852fc38b23ec3dda8c37bb0' 
  AND token = 'NmpoxOz/oK93y7Qx4P4i23K5FUlI+rRQYjmuLikPef8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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