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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aed67c8f6e2458023a09d0ea23f7759edfd914e41c52fd9b5d305eb20fcba354' 
  AND token = 'SYosH7zynb42vhP2hKnBaPsxOfi8J2lQk5oALkrP42k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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