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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd89ab4edb198a8ab52264bcc77ec8b6c5ca18f4618aff6028fc67dcbea9a68f' 
  AND token = '/ABHoPdV47dOc8wFEG7ZIliT9Qar272b5YsBr4VtBnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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