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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f97bbbed99cd7b71a8c97286e723c1d206018a8f152dc2b546848e7061dd2c6' 
  AND token = 'pcUyO+aapOBKOXhLBihiA7eSN91moGMA5n/e6On+9WI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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