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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de1866f643eb3948d9a7f4022e1c8490919403c01ba04b0f810b3dabe84ba4bf' 
  AND token = '8+YfYte1zk+nMlifji+L5AyjI02fhEas5CrGFjmmjg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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