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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3717624563e44d08ac17c689dbdbebb8ff4e017ad90e710300b3c706d73dd890' 
  AND token = 'PulWv8d740wqzX/9idz/dieD6BhYCRXve8p4l3RZn/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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