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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a3b24ba2e7cdc0a918cc98658053312d2f1bfc994d3524c267704d5ac78f31aa' 
  AND token = 'LakqGItRdngxdFYERlVg3wM10EH0vAsSyGDq8DAtguE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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