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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c050651d3b00699c7493e18cf8986473fcf5f3b57eb2cad46ea978e21568e87a' 
  AND token = 'WeitSh0OebbGgm3unwxVCsmbgseFiY7J2S0LJOCi8+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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