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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a4ca3ca778b3b31c6584952216a1044bb7297f6c43bc0de9425d330b5a9b3e1d' 
  AND token = 'lpW5uq7shjbII8CN217wND4zNxqQwJSaLdVzwk/qr78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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