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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3b1da7865eff575ce74b9128eb5a7db49dd7752bc95e021135054671166b94e' 
  AND token = 'BKng8YoTt81H7oaYVSVQ7rIvwuRDIKkDLo1v2ebhSi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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