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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '70da6ef35ee0d8877fd927d678f1fe1d55e6a5228bf340ffcff2380cc8d05ec7' 
  AND token = 'Fe502EsA3XL94MVFkXP9TGAqx96kiYr5C1UK/gxi3t8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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