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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '90dfd0b3b3a59afe8ded604f628af7d584f0a9d744c1a01d1b4d710b4f0c4a26' 
  AND token = 'XlHp80c7BsMIkXpFpYmI2pm5Z+kInQWcvAkZW0v5/SQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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