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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bbae4f028f1d2ba064d2affb66f605859a290dc8834cb667ff174e2cfd70d18b' 
  AND token = 'HyHV4qa9HzUcDTzLlyw5FY71MSM3fzAusc5w8Ta7cp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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