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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f2f14b56e79b1012cf9860b8050dd5e492ea0b4a1e35a79981a098d71f5d5691' 
  AND token = 'CrsWG3PG1RIDMVHo7YcGCdXkMpK0MCfEt10I8he3Wg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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