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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e716ffc33368fbd6a139a90c5ea2c1eebbcd00978b5eec880cb20e1cf6bf4130' 
  AND token = '15GH5lWBEUF2XqP676NvBjkHZt4c2T8vNb22JDG/AOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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