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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '83c54a4d4120a8f19deb2b466e29911b883ca4749939e3877048b740874dfff3' 
  AND token = 'g9P7HnUqn1Fx3qG48DDFc7Vw/5WtObGZxzkW3UkBeIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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