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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02047e5bda6042185348e39c5e78c086a59b878bc08d1624de6f98cabd735bee' 
  AND token = '93MynkDs+R+CLS9Nnjik6A6d80idHBMtmbKPk6bB+Yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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